Discrete-vortex simulation of a turbulent separation bubble

Masaru Kiya, Kyuro Sasaki, Mikio Arie

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)

Abstract

The discrete-vortex model is applied to simulate the separation bubble over a two-dimensional blunt flat plate with finite thickness and right-angled corners, which is aligned parallel to a uniform approaching stream. This flow situation is chosen because, unlike most previous applications of the model, the separation bubble is supposed to be strongly affected by a nearby solid surface. The major objective of this paper is to examine to what extent the discrete-vortex model is effective for such a flow. A simple procedure is employed to represent the effect of viscosity near the solid surface; in particular, the no-slip condition on the solid surface. A reduction in the circulation of elemental vortices is introduced as a function of their ages in order to represent the three-dimensional deformation of vortex filaments. An experiment was also performed for comparison purposes. The calculation yielded reasonable predictions of the time-mean and r.m.s. values of the velocity and the surface-pressure fluctuations, together with correlations between their fluctuating components, over most of the separation bubble. The interrelation between instantaneous spatial variations of the surface-pressure and velocity fluctuations were also obtained. A comparison between the calculated and measured results suggests that, in the real flow, the three-dimensional deformation of vortex filaments will become more and more dominant as the reattachment point is approached.

Original languageEnglish
Pages (from-to)219-244
Number of pages26
JournalJournal of Fluid Mechanics
Volume120
DOIs
Publication statusPublished - Jan 1 1982

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Modelling and Simulation

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